Results 11 to 20 of about 18,963,725 (262)
IEEE Access, 2018 In order to meet the requirements of high system throughput, massive connectivity, and asynchronous transmission for 5G and beyond, non-orthogonal transmission techniques, including modulation techniques and multiple access techniques, have attracted a ...
Xin Bian +4 more
doaj +3 more sources
Investigating power scaling factor for pattern division multiple access [PDF]
Indonesian Journal of Electrical Engineering and Computer SciencePattern division multiple access (PDMA) is a one type of multi-domain non-orthogonal multiple access (NOMA) that support massive connectivity and can improve spectral efficiency. The unique pattern is used by each user to map its transmitting data into a group of resource, which consist of frequency, code and spatial domain or combination of these ...
Linda Meylani +3 more
openaire +3 more sources
IET Communications, 2014 Orthogonal variable spreading factor‐based code division multiple access systems allocate vacant codes when new call(s) arrive. This study proposes a same rate assignment scheme which allocates a new call to most favourable code in the region crowded by same rate calls. This does not add to blocked codes because of previous calls but utilise the unused
Vipin Balyan, Davinder S Saini
exaly +2 more sources
Optimal Power Allocation for Cooperative Pattern Division Multiple Access Systems
Mathematical Problems in Engineering, 2021 This study focuses on the power allocation (PA) problem in code division multiple access (PDMA) networks with amplify-and-forward (AF) relays. We provide two wireless communication technical performance indexes, which are system throughput and outage probability.
Xiurong Zhang, Shaoli Kang, Xueqian Fu
openaire +1 more source
Uplink grant‐free pattern division multiple access transmission scheme by exploiting poly complementary sequence [PDF]
Transactions on Emerging Telecommunications Technologies, 2021 AbstractNon‐orthogonal multiple access (NOMA) technology is a key technology of the future cellular mobile communication system. It provides services for users under different channel conditions through signal superposition transmission and spectrum multiplexing.
Li, Shufeng +4 more
openaire +1 more source
Hybrid Iterative Multiuser Detection for Channel Coded Space Division Multiple Access OFDM Systems [PDF]
, 2006 Space division multiple access (SDMA) aided orthogonal frequency division multiplexing (OFDM) systems assisted by efficient multiuser detection (MUD) techniques have recently attracted intensive research interests.
Jiang, M. +5 more
core +2 more sources
Turbo receivers for interleave-division multiple-access systems [PDF]
, 2009 In this paper several turbo receivers for Interleave-Division Multiple-Access (IDMA) systems will be discussed. The multiple access system model is presented first. The optimal, Maximum A Posteriori (MAP) algorithm, is then presented.
Cristea, Bogdan Eugen +3 more
core +1 more source
Pattern division random access (PDRA) scheme for mMIMO systems
Dianxin kexue, 2022 To enhance the massive machine-type communications (mMTC) random access (RA) performance, a pattern division random access (PDRA) scheme was proposed for massive multiple-input multiple-output (mMIMO) systems.In this scheme, the pilot contention space ...
Xiaoming DAI +5 more
doaj +2 more sources
Three design aspects of multicarrier interleave division multiple access [PDF]
, 2008 This paper presents a novel generalized transceiver architecture, i.e., Multicarrier Interleave-Division-Multiplexing-aided Interleave Division Multiple Access (MC-IDM-IDMA). A parallel interference cancellation (PIC)-aided iterative multiuser detection (
Zhang, Rong, Hanzo, Lajos
core +1 more source
EXIT Chart Based Joint Code-Rate and Spreading-Factor Optimisation of Single-Carrier Interleave Division Multiple Access [PDF]
, 2007 —In this paper, we consider the joint code-rate and spreading-factor optimisation of turbo-style iterative joint detection and decoding assisted single-carrier interleave division multiple access (SC-IDMA) systems using different-rate convolutional codes
Zhang, R +3 more
core +2 more sources